US20210348647A1 - Bearing arrangement - Google Patents

Bearing arrangement Download PDF

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Publication number
US20210348647A1
US20210348647A1 US17/282,844 US201917282844A US2021348647A1 US 20210348647 A1 US20210348647 A1 US 20210348647A1 US 201917282844 A US201917282844 A US 201917282844A US 2021348647 A1 US2021348647 A1 US 2021348647A1
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United States
Prior art keywords
bearing
fit
tube
bearing tube
axial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US17/282,844
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English (en)
Inventor
Volker Ehlers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst St Georgen GmbH and Co KG
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Ebm Papst St Georgen GmbH and Co KG
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Filing date
Publication date
Priority claimed from DE102018129613.4A external-priority patent/DE102018129613A1/de
Priority claimed from DE102018129608.8A external-priority patent/DE102018129608B4/de
Priority claimed from DE102018129611.8A external-priority patent/DE102018129611A1/de
Application filed by Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Assigned to EBM-PAPST ST. GEORGEN GMBH & CO. KG reassignment EBM-PAPST ST. GEORGEN GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EHLERS, Volker
Publication of US20210348647A1 publication Critical patent/US20210348647A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/006—Tidal volume membrane pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/062—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/059—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/083—Sealings especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • F16C25/083—Ball or roller bearings self-adjusting with resilient means acting axially on a race ring to preload the bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/37—Retaining components in desired mutual position by a press fit connection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
    • F16C19/547—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings
    • F16C19/548—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/46—Fans, e.g. ventilators

Definitions

  • the disclosure relates to a bearing arrangement designed as a fixed/floating bearing for a rotor fan.
  • bearing tubes have fixed/floating bearing arrangements with floatingly projecting shaft loads.
  • a bearing tube with an inner shoulder or a geometrical shoulder, for adjoining a bearing is provided for bracing the bearings in an O-arrangement.
  • the first bearing is inserted into the bearing tube from one axial side.
  • a spring and the second bearing are inserted from the other axial side.
  • Both inner rings of the bearings are fixedly connected to be mounted to the shaft.
  • the bearing assembly is self-supporting up to the amount of the preload. If the outer ring of the first bearing is for example fixed by caulking, gluing, or a retaining ring, the mounting is defined in all directions.
  • the bearings are machined and inserted from two sides in such bearing tubes.
  • a geometrical bearing shoulder must be provided, which is not always desired.
  • the coaxiality of the bearing seats is not optimal with two-sided machining.
  • a bearing arrangement designed as a fixed/floating bearing for a fan rotor comprising a bearing tube, a compression spring, a shaft arranged coaxially with respective to the bearing tube, and two identically formed ball bearings arranged between the bearing tube and the shaft.
  • Each ball bearing has an inner ring and an outer ring. Multiple different fit zones are formed axially along the bearing tube.
  • a fixed bearing is attached by its inner ring on the shaft and its outer ring is fixed with a press fit on a continuous shoulder-free portion of the bearing tube.
  • another of the ball bearings as a floating bearing is attached by its inner ring to the shaft and its outer ring is axially displaceably arranged with a clearance fit on a continuous, shoulder-free portion of the bearing tube.
  • the compression spring is arranged in a third axial fit zone. The compression spring is positioned axially between the ball bearings exerting a preload against the outer rings of the ball bearings to eliminate bearing play of the floating bearing.
  • a bearing arrangement designed as a fixed/floating bearing for a rotor fan, is proposed with a bearing tube, a compression spring, a shaft arranged coaxially with respect to the bearing tube and two identically formed ball bearings arranged between the bearing tube and the shaft.
  • Each ball bearing has an inner ring and an outer ring. Multiple different fit zones are formed axially along the bearing tube. In a first axial fit zone, one of the ball bearings, as a fixed bearing, is attached by its inner ring on the shaft. Its outer ring is fixed with a press fit on a continuous shoulder-free portion of the bearing tube. In a second axial fit zone, another of the ball bearings, as a floating bearing, is attached by its inner ring to the shaft.
  • the compression spring is arranged in a third axial fit zone. It exerts a preload against the outer rings of the ball bearings.
  • the spring is positioned axially between the ball bearings and is designed to eliminate bearing play of the floating bearing. To this end, the compression spring is selected such that it has a sufficient spring force for the respective bearings.
  • the solution according to the disclosure does without geometrical shoulders or bearing shoulders on the bearing tube for the bearings.
  • the present disclosure provides different fit zones for the two bearings, one as a press fit and one as a clearance fit. This enables completely one-sided machining and assembly of the bearings. Furthermore, the coaxiality of the two bearing seats is optimized.
  • Assembly is simplified because the fixed bearing, the compression spring, and the floating bearing can be inserted from the same side and only pressing processes that can easily be monitored can be used. Also, no additional parts, such as retaining rings, or additional materials, such as adhesive, are required.
  • the different fit zones are preferably determined by different tolerance zones of the inner diameter of the bearing tube.
  • the regions of the compression spring and the floating bearing feature a clearance fit with the outer ring.
  • the region of the fixed bearing features a press fit with the outer ring of the bearing.
  • the bearing arrangement uses an O-arrangement braced on the outer ring.
  • the third axial fit zone corresponds to the second axial fit zone in the region of the compression spring.
  • the clearance fit in the region of the spring can have a greater tolerance than the one of the floating bearing.
  • an axial fit length L 1 of the first fit zone of the fixed bearing is defined as 0.35 ⁇ L 1 ⁇ D ⁇ 0.5 ⁇ L 1 .
  • D is an inner bearing tube diameter of the bearing tube.
  • an axial fit length L 2 of the second fit zone of the floating bearing is defined as 0.35 ⁇ L 2 ⁇ D ⁇ 0.5 ⁇ L 2 . This short axial length of the fit zones reduces required machining to small axial sections.
  • the third fit zone of the compression spring is always located axially between the two fit zones of the press fit and clearance fit of the two ball bearings.
  • the first and the second fit zones each adjoin axial edge sections of the bearing tube. Their position is thus unique and easily determined.
  • the entire axial holding force must be borne by the press fit of the outer ring of the fixed bearing with the bearing tube.
  • a material is selected for the bearing tube that has an expansion coefficient very similar to the material of the outer rings of the ball bearings.
  • the material of the outer rings of the ball bearings is even identical to a material of the bearing tube, for example, steel.
  • the outer rings of the ball bearings and the bearing tube are formed of soft magnetic steel. This is due to the fact that non-magnetic, austenitic steels have a too high expansion coefficient.
  • the expansion coefficient is of subordinate importance for the shaft to be mounted and may deviate from that of the bearing tube. But it is defined such that it is similar to the expansion coefficient of the inner ball bearing rings and that the press fit is not impaired and there is no impermissible radial change of air of the ball bearing.
  • an embodiment of the bearing arrangement is advantageous where a projection is formed on an axial end section of the bearing tube and integral with the bearing tube.
  • the projection comprises a receiving space for inserting a fan wheel.
  • FIG. 1 is a perspective cross-sectional view of a bearing arrangement of a rotor of a fan
  • FIG. 2 is a perspective cross-sectional view of a bearing arrangement of a rotor of a fan
  • FIG. 3 is a cross-sectional view of a fan with a bearing arrangement.
  • FIGS. 1 and 2 show two exemplary embodiments of bearing arrangements 1 designed as fixed/floating bearings for a fan rotor 11 .
  • FIG. 1 shows a perspective sectional view of the bearing arrangement 1 with the bearing tube 2 , a shaft 28 of a drive motor arranged coaxially with the bearing tube 2 , of which motor only the rotor 11 is shown.
  • Two identically configured ball bearing 3 , 6 each with an inner ring 4 , 7 and an outer ring 5 , 8 , are arranged between the bearing tube 2 and the shaft 28 .
  • One of the bearings is used as a fixed bearing and the other one as a floating bearing.
  • the compression spring 9 which exerts a spring force to eliminate the bearing clearance against the two outer rings 5 , 8 , is located axially between the two ball bearings 3 , 6 .
  • Different fit zones are formed due to different tolerance zones on the inner wall surface of the bearing tube 2 in the region of the two ball bearings 3 , 6 .
  • the fit of the two bearings due to different tolerance zones of the diameters are implemented as follows:
  • Diameter of the shaft 4.002-4.005 mm
  • Diameters of the inner rings 4 , 7 3.995-4.000 mm
  • Diameters of the outer rings 5 , 8 10.995-11.000 mm
  • Diameter of the bearing tube for ball bearing 6 (fixed bearing) 10.983-10.993 mm
  • Diameter of the bearing tube for ball bearing 3 (floating bearing) 11.000-11.011 mm
  • Diameter of the bearing tube in the region of the compression spring 9 11.000- 11.04 mm
  • the ball bearing 6 is configured as a fixed bearing, the ball bearing 3 as a floating bearing, but this arrangement may also be reversed.
  • the inner ring 7 is fastened to the shaft 28 .
  • the outer ring 8 is fixed to a continuous shoulder-free section of the bearing tube 2 by means of a press fit. No bearing shoulder or any other geometrical shoulder is provided on the inner wall surface of the bearing tube 2 .
  • the bearing tube 2 extends continuously without a step in the axial direction. Thus, all components can be mounted from a single axial side.
  • the second, identically configured ball bearing 3 is a floating bearing and likewise fastened with its inner ring 4 to the shaft 28 .
  • the outer ring 5 is also arranged in an axially movable manner and, with a clearance fit, on a continuous shoulder-free shoulder of the bearing tube 2 .
  • the third fit zone is provided in the axial region of the compression spring 9 between the two ball bearings 3 , 6 .
  • this zone corresponds to the fit zone of the ball bearing 3 defining the floating bearing, such that only two different fit zones are provided.
  • the third fit zone in the region of the compression spring 9 can be variably adjusted and may differ from the two fit zones of the ball bearings 3 , 6 .
  • the axial fit length L 1 of the first fit zone of the ball bearing 6 , defining the fixed bearing, and the second fit zone of the ball bearing 3 , defining the floating bearing, is further defined as 0.4 of the inner bearing tube diameter of the bearing tube 2 . Both fit zones each directly adjoin the axial edge sections of the bearing tube 2 .
  • a collar 25 formed integrally with the bearing tube 2 is configured on the upper axial end section of the bearing tube 2 , which collar defines the receiving space 87 for inserting the fan wheel 17 .
  • the exemplary embodiment according to FIG. 2 has the same features as the one from FIG. 1 . However, it differs in that the collar 25 is not provided on the bearing tube 2 but as a separate component. In the embodiment shown, the collar 25 is formed by a flow divider that is described in more detail with reference to FIG. 3 .
  • FIG. 3 shows a sectional view of a radial fan 100 with the bearing arrangement 1 from FIG. 1 .
  • the radial fan 100 includes an electric motor 92 configured as an encapsulated motor with a rotor 11 and a stator 32 .
  • the magnets of the rotor 11 are attached to the shaft 28 that extends axially along the axis of rotation through the radial fan 100 .
  • the fan wheel 17 configured as a radial fan wheel is fastened to the shaft 28 The fan wheel 17 when in operation, takes in air by means of its impeller vanes axially through the inlet 69 and blows out air via the discharge nozzle 33 at the outlet 44 .
  • the radial fan 100 further includes the fan housing, which is formed by the outer part 40 , the inner part 50 , and the housing cover 19 , where the motor 52 is accommodated.
  • the circuit board 110 with electronics components fixed thereon for regulating the radial fan 100 is attached axially between the inner part 50 and the motor 52 and to the housing cover 19 .
  • the inner part 50 on the one hand forms a free space for the electronics components on a side facing the motor 52 .
  • the inner part 50 defines, together with the outer part, the helical pressure space D on the opposite axial side of the radial fan 100 facing the outer part 40 .
  • the inner part 50 extends radially outwards between the outer part 40 and the housing cover 19 and is fixed by the outer part 40 and the housing cover 19 . Seals 25 are provided to seal off the two axial regions separated by the inner part 50 .
  • the electronics components are arranged in the free space adjacent to the pressure space D. Thus, the electronic components face the flow, whereby heat is dissipated to the inner part 50 and cooling takes place.
  • the flow divider 18 and the outer part 40 form a diffuser into the pressure space D.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
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  • Emergency Medicine (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Support Of The Bearing (AREA)
  • Rolling Contact Bearings (AREA)
US17/282,844 2018-11-23 2019-05-14 Bearing arrangement Abandoned US20210348647A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE102018129613.4A DE102018129613A1 (de) 2018-11-23 2018-11-23 Radiallüfter mit integrierter Kühlfunktion
DE102018129613.4 2018-11-23
DE102018129608.8A DE102018129608B4 (de) 2018-11-23 2018-11-23 Rotormontageeinheit
DE102018129611.8A DE102018129611A1 (de) 2018-11-23 2018-11-23 Rotormontageeinheit mit Kühlfunktion
DE102018129611.8 2018-11-23
DE102018129608.8 2018-11-23
PCT/EP2019/062391 WO2020104073A1 (fr) 2018-11-23 2019-05-14 Ensemble de support

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US20210348647A1 true US20210348647A1 (en) 2021-11-11

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US17/282,844 Abandoned US20210348647A1 (en) 2018-11-23 2019-05-14 Bearing arrangement
US17/287,074 Active 2040-01-01 US11781591B2 (en) 2018-11-23 2019-05-14 Radial ventilator

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US17/287,074 Active 2040-01-01 US11781591B2 (en) 2018-11-23 2019-05-14 Radial ventilator

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US (2) US20210348647A1 (fr)
EP (3) EP3821145A1 (fr)
KR (2) KR20210093230A (fr)
CN (6) CN112867868B (fr)
DE (1) DE202019102714U1 (fr)
WO (3) WO2020104073A1 (fr)

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US20210348647A1 (en) * 2018-11-23 2021-11-11 Ebm-Papst St. Georgen Gmbh & Co. Kg Bearing arrangement

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CN112867869B (zh) 2023-09-29
CN112867868A (zh) 2021-05-28
WO2020104075A1 (fr) 2020-05-28
CN112867868B (zh) 2023-04-21
WO2020104073A1 (fr) 2020-05-28
CN112840134A (zh) 2021-05-25
KR20210093230A (ko) 2021-07-27
EP3833875A1 (fr) 2021-06-16
EP3824188A1 (fr) 2021-05-26
KR20210096066A (ko) 2021-08-04
US20210355946A1 (en) 2021-11-18
EP3833875B1 (fr) 2023-07-26
CN210660659U (zh) 2020-06-02
CN112867869A (zh) 2021-05-28
US11781591B2 (en) 2023-10-10
CN210565190U (zh) 2020-05-19
DE202019102714U1 (de) 2019-05-27
EP3821145A1 (fr) 2021-05-19
CN210660710U (zh) 2020-06-02
WO2020104074A1 (fr) 2020-05-28

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